/*******************************************************************************
 * Copyright 2010 Simon Mieth
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 ******************************************************************************/

package cn.kkdlk.parse.processing;

import cn.kkdlk.parse.DraftDocument;
import cn.kkdlk.parse.common.DraftEntity;
import cn.kkdlk.parse.common.Layer;
import cn.kkdlk.parse.common.Type;

import java.util.Iterator;
import java.util.Map;

/**
 * This postprocessor remove all invisible entities and layers.
 *
 * @author <a href="mailto:simon.mieth@gmx.de">Simon Mieth</a>
 */
public class VisibilityFilter extends AbstractPostProcessor {

    public void process(DraftDocument doc, Map<String, Object> context)
            throws ProcessorException {
        Iterator<Layer> i = doc.getLayers().iterator();

        while (i.hasNext()) {
            Layer l = i.next();

            if (l.isVisible()) {
                for (Type<?> type : l.getEntityTypes()) {

                    Iterator<? extends DraftEntity> ei = l.getEntitiesByType(type).iterator();

                    while (ei.hasNext()) {
                        DraftEntity entity = ei.next();

                        if (!entity.isVisibile()) {
                            ei.remove();
                        }
                    }
                }
            } else {
                i.remove();
            }
        }
    }

    public void setProperties(Map<String, Object> properties) {

    }
}
